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Consolidated Statement of Changes in Net Assets (Liquidation Basis) (Detail) (USD $)
In Thousands, unless otherwise specified
1 Months Ended
Apr. 27, 2013
Jul. 31, 2012
Stockholders' equity as of March 23, 2013 $ 27,006 $ 442,231
Effects of adopting the liquidation basis of accounting:    
Initial adjustment of assets to estimated net realizable value 2,883  
Initial adjustment of liabilities to estimated settlement amounts (14,745)  
Net Assets (liquidation basis) as of March 24, 2013 15,144  
Change in estimated net realizable value of assets and liabilities     
Net Assets (liquidation basis) as of April 27, 2013 $ 15,144